WEHRLI WCF100373 17-22 L5P DURAMAX BILLET EXHAUST MANIFOLD KIT W/ GASKETS AND ARP HARDWARE

WCFab’s 2017-2025 Duramax Billet Exhaust Manifolds with EGR Riser Flange replace the restrictive factory cast parts with high-strength, TIG-welded high-flow billet steel components designed to enhance exhaust flow characteristics, improving turbo spool up, lowering EGTs and increasing power and economy. These manifolds are exhaust port gasket matched and internally divided for optimal flow with OEM or ported cylinder heads.

Outlet locations allow full compatibility with OEM style up pipes and are designed to be paired with WCFab’s 2” Stainless High-Flow Up Pipes (sold separately as part WCF100624) for optimized performance.

Includes new gaskets, ARP 12PT fasteners, and assembly lube for easy install (up pipe fastener kits sold separately). Finished in Black Ceramic Coat rated for 1800ºF. No tuning required.

Also compatible with 2019+ L5D Duramax (4500/5500/6500) Medium Duty Trucks.

- Fully TIG Welded, CNC machined billet steel exhaust manifolds
- Finished in Black Ceramic Coat rated for 1800ºF
- Includes new gaskets for manifold to cylinder head, EGR flange, and manifold to up pipe
- Includes ARP 12PT Fasteners and washers for installation to cylinder head. Up pipe fastener kits sold separately as part WCF100199.
- 1/8 NPT port (and optional plug) included in driver side manifold for installation of EGT or drive pressure sensor
- No tuning required.

Enhance the performance of your 2017-2024 Duramax engine with the WEHRLI WCF100373 17-22 L5P Billet Exhaust Manifold Kit. Crafted by WCFab, these high-strength billet steel exhaust manifolds are expertly TIG-welded to replace the factory cast components effectively. Designed to boost exhaust flow characteristics, these manifolds contribute to improved turbo spool up, reduced EGTs, and increased power and fuel efficiency.

The exhaust port gasket matched and internally divided construction of these manifolds ensures optimal flow with OEM or ported cylinder heads. Pair them with WCFab’s 2” Stainless High-Flow Up Pipes for superior performance (up pipes sold separately).

This kit includes new gaskets, ARP 12PT fasteners, and assembly lube, simplifying the installation process. The Black Ceramic Coat finish, capable of withstanding temperatures up to 1800ºF, not only enhances durability but also adds a sleek look to your engine bay.

These manifolds are fully TIG-welded and CNC machined for precision. The package includes gaskets for manifold to cylinder head, EGR flange, and manifold to up pipe connections. With ARP 12PT Fasteners and washers for installation, this kit ensures a secure fit.

Additionally, the driver side manifold features a 1/8 NPT port for easy installation of an EGT or drive pressure sensor, offering further customization options. No tuning is required, making this kit a hassle-free upgrade for your Duramax engine. Compatible with 2019+ L5D Duramax Medium Duty Trucks, this kit is a reliable choice for enthusiasts seeking performance and quality.